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timber rafting

n. A log transportation method in which logs are tied together into rafts and drifted or pulled across a water body or down a flatter river.

Wikipedia
Timber rafting

Timber rafting is a log transportation method in which logs are tied together into rafts and drifted or pulled across a water body or down a flatter river. It is arguably the second cheapest method of transportation of timber, next after log driving. Both methods may be referred to as timber floating.